问题 解答题
计算,写出计算过程
4
5
×
7
8
÷
7
10
1
2
×
1
6
+
5
12
÷
1
2
1
4
÷(3-
7
13
-
6
13
)
8
9
÷[(
5
6
-
2
3
1
4
]
1
15
x=
7
20
×
4
7
答案

(1)

4
5
×
7
8
÷
7
10

=

4
5
×
7
8
×
10
7

=1;

(2)

1
2
×
1
6
+
5
12
÷
1
2

=

1
12
+
5
12
×2

=

1
12
+
5
6

=

11
12

(3)

1
4
÷(3-
7
13
-
6
13

=

1
4
÷[3-(
7
13
+
6
13
)]

=

1
4
÷[3-1]

=

1
8

(4)

8
9
÷[(
5
6
-
2
3
)÷
1
4
]

=

8
9
÷[
1
6
×4]

=

8
9
÷
2
3

=

8
9
×
3
2

=

4
3

(5)

1
15
x=
7
20
×
4
7

1
15
x=
1
5

1
15
x×15=
1
5
×15

x=3.

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